<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <meta http-equiv="X-UA-Compatible" content="ie=edge">
  <title>Document</title>
</head>
<body>
  <form action="#">

    <!-- 
      自动完成功能
      autocomplete 首先需要提交按钮
      这个表单必须要有name属性

     -->
     <!-- 自动完成功能 -->
    用户名：<input type="text" name="username" id="" placeholder="请输入用户名" autofocus="autofocus" autocomplete>
  <input type="file" name="" id="" multiple>
  昵称：<input type="text" name="lovername" id="" required accesskey="s">

  <input type="submit">
  </form>
</body>
</html>